Structure of fan for reducing vibration

ABSTRACT

A structure of a fan capable of reducing vibration is disclosed. The fan has a base and a fan pivotally connected to the base. The base has axial sleeve concentrically surrounding least one axle. The fan is connected to an axis from inside. The axis has a resilient element is positioned around an end of the axis, another end of the axis has a neck concentrically surrounded by at least one buffer. Thus, the resilient element and the buffer can reduce the vibration generated by the fan.

BACKGROUND OF THE INVENTION

1. Field of Invention

The present invention generally relates to a structure of a fan, and more particularly to a structure of a fan comprising a buffer at a distal end of an axis and a resilient element concentrically positioned at another end of the axis to reduce the vibration of the fan.

2. Description of the Related Art

Along with the rapid development of electronic technology, the processing speed and the capacity of the electronic components are being continuously upgraded. However, it is important that heat generated during the operation of the electronic components has to be timely dissipated otherwise the high temperature due to accumulation of heat would adversely affect the normal operation of the electronic components or even damage the electronic components. For dissipating the heat, the fan is a usual solution.

When the fan rotates, cool air from outside is drawn inside the electronic device via the air inlet of the fan so that the cool air exchanges the heat with the electronic components and then the air flows out via the air outlet to dissipate the heat. However, the sizes and weights of the blades of the fan are not identical and therefore the weight distribution around the rotation axis of the fan is not uniformly distributed which may cause the fan to generate vibrations during rotation. When the rotary starts or stops, the magnetic drive tends the rotary corresponding to the stator to vibrate axially, which is further transferred to the peripheral device to cause resonation. Thus, the axle may get damaged by these vibrations.

The conventional motor comprises a stator having a hollow positioning axle at the central region thereof, and a metal coil surrounding the positioning axle. The metal coil is adopted for receiving the external current and converting the current into the magnetic field to drive the motor. The motor comprises the rotatable axle positioned at the inner side of the positioning axle and can rotate along the axis of the stator. A cover-like rotary comprises a magnet disposed around the inner side, and the axis of the rotary is securely positioned on the rotatable axle. The rotation energy is outputted due to change in the magnetic field of the stator. The motor further comprises a buffer positioned between the rotatable axle and the rotary to absorb any impact occurring to the rotatable axle due to vibration of the rotatable axle. The rotatable axle comprises a buckle at a bottom portion thereof to limit the upward movement of the rotatable axle corresponding to the stator.

The defect of the conventional design is that the buffer is only positioned between the rotatable axle and the rotary to reduce the downward vibration, but the rotary also moves up and down relative to the stator during the starting and stopping of the motor. Furthermore, because the weight around the rotary is unevenly distributed due to different size and weight of the blades, therefore when the fan rotates, vibrations are generated. Even though the conventional fan has a buckle to buckle the rotatable axle to reduce the upward vibration, the upward vibration on the buckle is transferred to the bottom of the rotatable axle. Thus, both the rotatable axle and the buckle receive the upward vibration and may easily get damaged and the buckle may come loose from the rotatable axle. Accordingly, the rotatable axle may also come loose from the axle and the service life of the axle will be reduced.

Accordingly, how to reduce the vibration noise of the fan is an important issue for the manufacturers in the field.

SUMMARY OF THE INVENTION

According to an aspect of the present invention, a resilient element and at least one buffer are positioned penetrating through the two ends of the axis of the axle to absorb up and down axial vibration.

The fan structure of the present invention comprises a axis and a fan positioned axially on the axis. The axis has an axial sleeve for concentrically surrounding at least one axle. The fan is connected to an axis from inside. The axis has a resilient element and the end portion axis is connected to the fan and another end of the axis comprises a neck portion penetrating through the axle and at least one buffer. The buffer is positions at an end portion of the axis connected to the axle. Because the fan is not directly connected to the buffer, and therefore the resilient element and the buffer can reduce the vibration generated by the fan.

BRIEF DESCRIPTION OF THE DRAWING

For a more complete understanding of the present invention, reference will now be made to the following detailed description of preferred embodiments taken in conjunction with the following accompanying drawings.

FIG. 1 is an exploded view of a fan according to an embodiment of the present invention.

FIG. 2 is a perspective view of the fan according to an embodiment of the present invention.

FIG. 3 is a perspective view of a fan during the operation of the fan according to an embodiment of the present invention.

FIG. 4 is a perspective view of the fan having an additional buckle according to another embodiment of the present invention.

DETAIL DESCRIPTION OF THE INVENTION

Referring to FIG. 1 and 2, the fan comprises a base 10, a fan 11, a resilient element 12 and a buffer 13. The base 10 comprises a hollow axle sleeve 101 having a distal end 1011, a primal end 1012 and a protrusion 1013 formed on an inner sidewall thereof. In the present embodiment of the present invention, the primal end 1012 of the axle sleeve 101 is hollow, but it not limited as such, the primal end 1012 of the axial sleeve 101 may also be a closed end. The axial sleeve 101 comprises at least one axle 102 (two axles 102 a and 102 b are shown in FIG. 1 and 2). The axles 102 a and 102 b are penetrated into the axial sleeve 101 from the distal end 1011 and the primal end 1012 respectively until they come in contact with the two sides of the protrusion 1013. At least one stator 103 is concentrically positioned surrounding the outer wall of the axial sleeve 101.

The fan 11 comprises a plurality of blades 112 extending outward and an axis 113 connected to the inner side of the fan 11. A resilient element 12 is disposed around the axis 113. The resilient element 12 is preferably a spring or elastic plate. The axis 113 comprises a neck 1131 positioned at an end 1132 thereof. The fan 11 has at least one rotary axis 114 positioned at the inner side of the fan 11 concentric to the stator 103.

The buffer 13 may be a spring or an elastic plate, or a plastic polymeric material, for example, silicon. The buffer 13 is penetrated into the axial sleeve 101 from the primal end 1012 of the axial sleeve 101.

The end 1132 of the axis 113 is penetrated through the axle 102 (the preferred embodiment shows the axis penetrating through the axle 102 a and 102 b) and the buffer 13 so that the neck 1131 is concentrically positioned within the buffer 13, and the buffer 13 is positioned between the axle 102 b and the end 1132 of the axis 113.

Furthermore, a first buckle 14 is adopted to buckle the neck 1131 to position the washer 14 between the axle 102 b and the buffer 13 to securely position the axis 113.

Referring to FIG. 3, when the fan 11 rotates, because size and the weight of the blades 112 are not identical to each other, and therefore the weight distribution around the axis 113 is not uniform. Thus, the axis 113 is not stable and vibrates up and down (as indicated by the arrow in FIG. 3). The resilient element 12 positioned around the axis 113 readily absorbs the downward vibrations while the buffer 13 readily absorbs the upward vibrations. Thus, the vibration of the fan 11 can be readily absorbed by the resilient element 12 and the buffer 13 and thereby reduce the vibration generated by the fan 11 and prevent the noise from transferring to the axle 102 (102 b in FIG. 3) and the first washer 14.

Referring to FIG. 4, the neck 1131 of the axis 113 comprises a second washer 15 positioned between the buffer 13 and the end 1132 of the axis 113. Thus, the range of the buffer 13 contacting the end 1132 of the axis 113 is increased by the second washer 15, and the buffer 13 can be more securely positioned around the neck 1131 to prevent the buffer 13 from coming loose from the axis 113.

While the invention has been described in conjunction with a specific best mode, it is to be understood that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations in which fall within the spirit and scope of the included claims. All matters set forth herein or shown in the accompanying drawings are to be interpreted in an illustrative and non-limiting sense. 

What is claimed is:
 1. A structure of a fan capable of reducing vibration, comprising: a base comprising an axial sleeve surrounding at least one axle; and a fan, axially positioned on said base and connected to an axis from inside, wherein a resilient element is concentrically positioned around one end portion of said axis and a neck is positioned at another end of said axis, and wherein at least one buffer is positioned around said neck to reduce vibrations generated by said fan.
 2. The structure of a fan capable of reducing vibration according to claim 1, wherein said fan comprises a plurality of blades extending outwards.
 3. The structure of a fan capable of reducing vibration according to claim 1, wherein said resilient element comprises a spring.
 4. The structure of a fan capable of reducing vibration according to claim 1, wherein said resilient element comprises an elastic plate.
 5. The structure of a fan capable of reducing vibration according to claim 1, wherein said buffer comprises an elastic element.
 6. The structure of a fan capable of reducing vibration according to claim 5, wherein said resilient element comprises a plastic polymeric material, a spring or an elastic plate.
 7. The structure of a fan capable of reducing vibration according to claim 5, wherein said plastic polymeric material comprises silicon.
 8. The structure of a fan capable of reducing vibration according to claim 1, wherein said neck comprises a first buckle positioned between said buffer and said axle.
 9. The structure of a fan capable of reducing vibration according to claim 1, wherein said neck has a second buckle positioned between said buffer and said axle. 